The chairman of state-owned Jiuquan Iron & Steel Group is being probed for “serious disciplinary violations”, China’s corruption watchdog said, in further evidence that the government has intensified its crackdown on graft in the sector.

China is stepping up its anti-corruption campaign on government officials and state-owned companies. Companies targeted earlier have included Shenhua Group, China National Petroleum Corporation and China National Nuclear Corp.

Jiuquan Chairman Feng Jie is being investigated for “serious disciplinary violations” – a term usually referring to corruption – China’s Central Commission for Discipline Inspection said in a notice published late on Thursday.